Add --parse-all option in order to benchmark and measure the scanner/parser performance.

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index 2456ed6b1defb6ad7f97bc4650d3a575828b11ee..927ad6e8ba73c7c00c380e63cef6737a0b1b64a8 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -11414,6 +11414,51 @@ RawError* Library::CompileAll() {
 }
 
 
+RawError* Library::ParseAll(Thread* thread) {
+  Zone* zone = thread->zone();
+  Error& error = Error::Handle(zone);
+  Isolate* isolate = thread->isolate();
+  const GrowableObjectArray& libs = GrowableObjectArray::Handle(
+      isolate->object_store()->libraries());
+  Library& lib = Library::Handle(zone);
+  Class& cls = Class::Handle(zone);
+  for (int i = 0; i < libs.Length(); i++) {
+    lib ^= libs.At(i);
+    ClassDictionaryIterator it(lib, ClassDictionaryIterator::kIteratePrivate);
+    while (it.HasNext()) {
+      cls = it.GetNextClass();
+      error = cls.EnsureIsFinalized(thread);
+      if (!error.IsNull()) {
+        return error.raw();
+      }
+      error = Compiler::ParseAllFunctions(cls);
+      if (!error.IsNull()) {
+        return error.raw();
+      }
+    }
+  }
+
+  // Inner functions get added to the closures array. As part of compilation
+  // more closures can be added to the end of the array. Compile all the
+  // closures until we have reached the end of the "worklist".
+  const GrowableObjectArray& closures = GrowableObjectArray::Handle(zone,
+      Isolate::Current()->object_store()->closure_functions());
+  Function& func = Function::Handle(zone);
+  for (int i = 0; i < closures.Length(); i++) {
+    func ^= closures.At(i);
+    if (!func.HasCode()) {
+      error = Compiler::ParseFunction(thread, func);
+      if (!error.IsNull()) {
+        return error.raw();
+      }
+      func.ClearICDataArray();
+      func.ClearCode();
+    }
+  }
+  return error.raw();
+}
+
+
 // Return Function::null() if function does not exist in libs.
 RawFunction* Library::GetFunction(const GrowableArray<Library*>& libs,
                                   const char* class_name,